394 results about "Fluoroboric acid" patented technology

The invention discloses an electrolyte with a temperature switch function and a preparation method and application thereof, and relates to the technical field of lithium ion batteries. The electrolyte provided by the invention comprises the following components: lithium salt, a first organic solvent and a polymer, the lithium salt is at least one of lithium bis (trifluoromethylsulfonyl) imide, lithium bis (fluorosulfonyl) imide, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium difluoro (oxalato) borate and lithium bis (oxalato) borate; the polymer is polymethacrylate, and the first organic solvent is [Cnmim] [TFSI]. According to the electrolyte, the reversible phase transformation process is realized, the electrode reaction can be closed at high temperature, and the lithium battery is prevented from being out of control due to overheating; and when the temperature is reduced to normal temperature, the battery can work normally. The phase transition temperature of the electrolyte is flexible and controllable, and the phase transition temperature can be regulated and controlled to a reasonable interval by optimizing the composition of the electrolyte and the dosage (concentration) of each component, that is, the phase transition temperature is higher than the normal working temperature of the battery and lower than the initial temperature of the heat release side reaction.

The invention provides a non-aqueous electrolyte, a lithium ion battery, a battery module, a battery pack and a power utilization device, the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an electrolyte additive, and the electrolyte additive comprises 1, 3-propane sultone, fluoroethylene carbonate, vinylene carbonate, lithium tetrafluoroborate and a compound I shown in the formula I. The non-aqueous electrolyte is applied to the lithium ion battery, and the cycle life of the lithium ion battery is prolonged.

A compound or molecular complex. The compound or molecular complex comprises: a metal chelator configured for chelation with a radioactive isotope or a non-radioactive isotope; and a trifluoroborate (BF3)-containing moiety configured for 19F / 18F exchange or a precursor thereof; and optionally a cell-targeting domain.

The invention relates to the technical field of welding, in particular to a lead-free solder composition and a preparation method thereof. The composition comprises brazing filler metal and a brazing flux, wherein the brazing filler metal comprises 55 to 65 parts of copper, 30 to 40 parts of zinc, 0.5 to 1 part of silver, 0.1 to 1 part of tin, 0.1 to 0.5 part of nickel, 0.02 to 0.15 part of lanthanum, 0.03 to 0.15 part of cerium and 0.05 to 0.2 part of indium; the brazing flux comprises 18-22 parts of borax, 13-17 parts of boric acid, 25-32 parts of a potassium fluoride and potassium fluoborate compound, 3-5 parts of calcium fluoride, 12-16 parts of aluminum oxide and 8-11 parts of magnesium oxide. The lead-free solder composition does not contain toxic lead elements, pollution to the environment and the ecological system is little, the wettability, corrosion resistance, strength, stability and the like of the lead-free solder composition are improved, and the welding quality is comprehensively improved. According to the preparation method, uniform distribution and accurate control of the brazing filler metal and the brazing flux are guaranteed, stability and consistency of product quality are guaranteed, and the preparation method is easy and convenient to operate and suitable for mass production.

The invention relates to viologen-anthraquinone composite electrochromic liquid and a preparation method thereof, the viologen-anthraquinone composite electrochromic liquid comprises 1.2-2.5 parts by mole of viologen salt, 0.8-1.5 parts by mole of anthraquinone derivative and 8-12 parts by mole of electrolyte; the viologen salt is ethyl viologen tetrafluoroborate or heptyl viologen tetrafluoroborate or octyl viologen tetrafluoroborate; the anthraquinone derivative is 1-ethylamino-4-hydroxy anthraquinone or acid blue 43; the preparation method comprises the following steps: preparing an electrolyte solution; adding purple refined salt and anthraquinone derivatives according to the formula; fully dissolving the electrochromic material to form uniform and transparent initial liquid; and degassing the initial liquid to remove oxygen dissolved in the initial liquid. The electrochromic liquid has the advantages that after the purple refined salt and the anthraquinone derivative are added into the dissolving solution according to the proportion of the formula, the two color-changing materials are jointly dissolved in the electrolyte, and when the two color-changing materials are reduced at the same time, spectrum superposition absorbed by the two color-changing materials can cover the whole visible region, so that black and white switching of the electrochromic liquid is realized, and the use effect is good.

The invention discloses an ionic liquid-based electrolyte, a wide-temperature-range high-voltage supercapacitor and application of the wide-temperature-range high-voltage supercapacitor. The wide-temperature-range high-voltage supercapacitor comprises a eutectic ionic liquid system and an organic solvent, the eutectic ionic liquid system comprises at least two ionic liquids; the ionic liquid comprises cations and anions; the positive ions are selected from at least one of pyrrolidinyl positive ions, piperidinyl positive ions, imidazolyl positive ions and quaternary ammonium positive ions containing different side chains; the anion is selected from at least one of tetrafluoroborate, hexafluorophosphate, bis (trifluoromethylsulfonyl imine), bis (fluorosulfonyl imine) and tetracyanoborate; the organic solvent comprises at least one of fluorinated carbonic ester, fluorinated carboxylic ester, sulfones, ethers and nitriles. The supercapacitor based on the ionic liquid-based electrolyte can stably operate in a wide temperature range, so that the wide-temperature-range high-voltage supercapacitor can be suitable for an extreme working environment, and high energy density and power density are achieved.

The invention relates to the technical field of chemical synthesis, and particularly discloses a synthesis method of 2-fluoro-3-nitrobenzoic acid. The preparation method comprises the following steps: by taking 2-methyl-6-nitroaniline as an initial raw material, firstly preparing aromatic diazonium salt through diazotization reaction, and then carrying out Balz-Schiemann reaction on the aromatic diazonium salt and fluoboric acid under the condition of a specific catalyst, so as to prepare the 2-fluoro-3-nitrotoluene. And finally, under the condition of a specific catalyst, carrying out oxidation reaction on the 2-fluoro-3-nitrotoluene to prepare the 2-fluoro-3-nitrobenzoic acid. The white 2-fluoro-3-nitrobenzoic acid with the total yield being 85% or above and the purity being 99% or above is finally prepared, the method has the advantages of being low in production cost, high in process safety and the like, large-scale production of the 2-fluoro-3-nitrobenzoic acid is easily achieved, and the method has very important significance for widening the application range of the 2-fluoro-3-nitrobenzoic acid.

The invention relates to a preparation method of lithium fluoroborate containing unsaturated bonds, and belongs to the technical field of lithium ion battery additives. The preparation method comprises the following steps: carrying out reaction on organic acid lithium containing unsaturated bonds and boron trifluoride gas in a solvent at a low temperature of-10 to 0 DEG C, and carrying out solid-liquid separation to obtain a lithium fluoroborate crude product containing unsaturated bonds; the solvent is a poor solvent of lithium fluoroborate containing unsaturated bonds. According to the method, boron trifluoride gas is used as a fluorine reagent, so that introduction of water is avoided; the method has the advantages of simple operation, high product quality, high yield, low cost, full utilization of raw materials, reduction of the generation of three wastes, and suitableness for large-scale production. The yield of the obtained product can reach 96% or above, and the purity can reach 99% or above.

The invention discloses a lithium fluoride in-situ coated sulfide solid electrolyte and a preparation method thereof, and belongs to the technical field of solid-state lithium batteries, the preparation method comprises the following steps: mixing a sulfide solid electrolyte with lithium tetrafluoroborate to obtain mixed powder, and under the disturbance of inert gas flow, carrying out a heat-preservation and pressure-maintaining reaction to obtain the lithium fluoride in-situ coated sulfide solid electrolyte. After the reaction is finished, naturally cooling to room temperature to obtain a lithium fluoride coated sulfide solid electrolyte; the mass fraction of the lithium tetrafluoroborate in the mixed powder is 1-10%. The lithium tetrafluoroborate used in the preparation method provided by the invention is a common salt, no gas or liquid is generated in the reaction process, the preparation method is environment-friendly, the process is simple, and later industrial preparation is facilitated; the lithium tetrafluoroborate has the advantages of low cost and environmental friendliness; and particularly, the sulfide solid electrolyte can be uniformly dispersed and uniformly coated on the surface under airflow disturbance.

The invention discloses a perovskite composition as well as a preparation method and application thereof. The perovskite composition is prepared from the following raw materials: (FA < 0.95 > MA < 0.05 >) < 0.95 > Cs < 0.05 > Pb < (I < 0.95 > Br < 0.05 >) < 3 > and an additive, the additive is prepared from at least one of 1-octyl-3-methylimidazolium tetrafluoroborate, 1-butyl-1-methylpiperidine tetrafluoroborate and 1-butyl-4-methylpyridine tetrafluoroborate, and the additive is prepared from at least one of 1-octyl-3-methylimidazolium tetrafluoroborate, 1-butyl-1-methylpiperidine tetrafluoroborate and 1-butyl-4- The perovskite composition provided by the invention can effectively improve the light absorption performance, the carrier transport performance and the interface contact quality of a perovskite thin film, so that the photoelectric conversion efficiency of a perovskite solar cell is improved.

The invention provides a compound guanidine fluoroborate and a guanidine fluoroborate nonlinear optical crystal as well as a preparation method and application, the chemical formula of the compound is [C (NH2) 3] 3B3O3F6, the molecular weight is 370.66, a room temperature solution method is adopted, the molecular weight of the guanidine fluoroborate nonlinear optical crystal is 370.66, the crystal belongs to a monoclinic system, the space group is Pc, and the cell parameters are as follows: a = 8.5366 (10), b = 11.5066 (12), c = 9.2274 (9), alpha = 90 degrees, beta = 122.682 degrees and gamma = 90 degrees. And the unit cell volume is 762.883. And growing the crystal by adopting a room-temperature solution method or a hydrothermal method. The crystal has good chemical stability, and can be used as a short-wavelength nonlinear optical crystal in an all-solid-state laser.

The invention provides a preparation method and application of a compound cesium ammonium fluoborate and a cesium ammonium fluoborate nonlinear optical crystal. The chemical formula of the compound is CsNH4B8O12F2; the chemical formula of the crystal is CsNH4B8O12F2, the crystal belongs to a trigonal system, the space group is P321, and the unit cell parameters are as follows: a = b = 6.5858 (4) + / -0.02, c = 7.8163 (6) + / -0.02, alpha = beta = 90 degrees, gamma = 120 degrees and Z = 1. The crystal is grown by adopting a vacuum high-temperature solution method, a room-temperature solution method or a hydrothermal method, and the ultraviolet transmission cut-off edge of the crystal is lower than 190 nm. The nonlinear optical effect of the crystal is about 2.5 times of that of KH2PO4 (KDP), and the shortest I-type phase matching wavelength is 175.5 nm. The crystal has the advantages of simple preparation method, low toxicity of used initial raw materials, small harm to human bodies, stable physical and chemical properties, uniaxial crystal, easiness in application and the like. The method can be widely applied to nonlinear optical devices such as ultraviolet and deep ultraviolet all-solid-state lasers, optical parametric oscillators and the like.

The invention belongs to the technical field of preparation of compounds, and discloses high-purity 2-imidazolidinone and a preparation method thereof. The preparation method of the high-purity 2-imidazolidinone comprises the following steps: reacting ethylenediamine, dimethyl carbonate and an ionic liquid catalyst to obtain primary 2-imidazolidinone; mixing the obtained primary 2-imidazolidinone with dimethyl carbonate, and filtering to obtain high-purity 2-imidazolidinone; the ionic liquid catalyst is chloridized 1-butyl-3-methylimidazole, brominated 1-butyl-3-methylimidazole, chloridized 1-ethyl-3-methylimidazole, brominated 1-ethyl-3-methylimidazole, 1-butyl-3-methylimidazole tetrafluoroborate or 1-ethyl-3-methylimidazole tetrafluoroborate, and the ionic liquid catalyst is an ionic liquid catalyst which is chloridized 1-butyl-3-methylimidazole, brominated 1-ethyl-3-methylimidazole, brominated 1-ethyl-3-methylimidazole tetrafluoroborate or 1-ethyl-3-methylimidazole tetrafluoroborate. According to the preparation method of the high-purity 2-imidazolidinone, a small amount of high-boiling-point byproducts such as MI and NMI and a dimethyl carbonate solution are further treated, and the target product MI with high purity is obtained.

The invention discloses a preparation method of high-strength villiaumite with fluorine ion release capacity and application of the high-strength villiaumite in 3D (three-dimensional) printing orthodontic appliances. The high-strength villiaumite has four benzyl groups and at least one polymerizable reaction group; the tetrabenzyl structure provides extremely high strength for the 3D printing appliance, the acrylate structure provides good long-term use stability for the 3D printing appliance, and the tetrafluoroboric acid structure provides excellent fluorine ion release ability for the 3D printing appliance; and the influence on the product surface caused by dissolution in the treatment period can be avoided, the surface smoothness can be improved, and the application prospect is remarkable.

The invention discloses an interface passivation material, a solar cell, a photovoltaic power generation system and electric equipment, the interface passivation material comprises a first compound with a chemical formula of formula (1) and / or a second compound with a chemical formula of formula (2): # imgabs0 #, Ar is an aromatic group, Q is a functional group containing reactive hydrogen, A + is selected from an ammonium group or a phosphonium group, and B + is selected from an amino group or a phosphonium group. X <-> is selected from any one of halogen ions, halogen-like ions, oxyacid radical ions, fluoroborate radical ions and sulfimide anions. The interface passivation material can be used in a solar cell to passivate interface defects of a light absorption layer, improve carrier transport performance and improve photoelectric conversion efficiency and stability of the solar cell.

The low-temperature electrolyte comprises an organic solvent, a lithium salt and an additive, and the mass percentage ratio of the organic solvent to the lithium salt to the additive is (70-90): (5-20): (0.2-3); the organic solvent is composed of cyclic carbonate, chain carbonate and chain carboxylate, the mass percentage of the cyclic carbonate, the chain carbonate and the chain carboxylate is 10-20: 10-30: 10-80, the cyclic carbonate is one or two of ethylene carbonate and propylene carbonate, the chain carbonate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate, and the chain carboxylate is one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate and methyl propyl carbonate. The lithium salt is one or more of lithium hexafluorophosphate, lithium perchlorate and lithium tetrafluoroborate. Compared with a single auxiliary additive, the low-temperature performance of the electrolyte can be remarkably improved by combining the amino-containing nicotinonitrile compound with the auxiliary additive according to the proportion.

The invention relates to the technical field of electrolytes, in particular to a wide-temperature-range high-voltage lithium ion battery electrolyte containing an amide solvent and a preparation method of the wide-temperature-range high-voltage lithium ion battery electrolyte. The fluorinated amide solvent comprises a main solvent and a cosolvent, the main solvent comprises one or more of perfluoro-2-methyl pyrrolidone, perfluoro-N-methyl pyrrolidone, perfluoro-epsilon-caprolactam, N, N-difluoroethyl formamide and trifluoroacetamide, and the cosolvent comprises one or more of perfluoro-2-methyl pyrrolidone, perfluoro-N-methyl pyrrolidone, perfluoro-epsilon-caprolactam, N, N-difluoroethyl formamide and trifluoroacetamide. The lithium salt comprises one or more of lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethanesulfonyl) imide, lithium bis (oxalato) borate, lithium difluoro (oxalato) borate and lithium tetrafluoroborate; the functional additives comprise a high-voltage additive, a temperature-adaptive additive and a flame retardant. The obtained electrolyte can maintain good electrochemical performance in a wide temperature range, has high voltage stability, improves the energy density and safety of the lithium ion battery, and prolongs the cycle life of the lithium ion battery.

A method for preparing an ultra-microporous metal-organic framework (MOF) and its application in propylene and propane adsorption separation, belonging to the technical field of crystalline materials, is disclosed. The MOF is derived from the organic ligands D-camphoric acid, 3-amino-1,2,4-triazole, and anhydrous zinc acetate via a solvothermal reaction in N,N-dimethylformamide and tetrafluoroboric acid. Gas adsorption studies have shown that this MOF has the potential to separate propylene and propane gas molecules.

The invention discloses a 3-imido-4, 5-diaryl boron oxygen heterocyclic ring onium salt derivative as well as a preparation method and application of the 3-imido-4, 5-diaryl boron oxygen heterocyclic ring onium salt derivative. The 3-imido-4, 5-diaryl boron oxygen heterocycle onium salt derivative is prepared by taking acetylenic ketone potassium fluoborate, organic amine and 2-(trimethylsilyl) phenyl trifluoromethanesulfonate as raw materials, inorganic alkali and a weak acid buffer as accelerators and water and acetonitrile as solvents through a one-pot two-step reaction, and the compound can be used for preparing organic fluorescent materials, such as organic fluorescent materials, organic fluorescent materials, organic fluorescent materials, organic fluorescent materials, organic fluorescent materials and organic fluorescent materials. The compound has obvious aggregation-induced emission (AIE) property, high quantum yield and wider fluorescence range. The target product is prepared with high atom economy reaction and high yield, and the method has the advantages of cheap and easily available raw materials, mild reaction conditions, short synthetic route, wide universal range of substrates and the like.

The present invention relates to an energetic perfluoroborate binder, a preparation method thereof and an application thereof, belonging to the technical field of energetic binders. The structural formula of the binder is:; wherein, n is a positive integer less than or equal to 20. The main raw materials of the binder are 1H,1H,2H,3H,3H-perfluorononane-1,2-diol, boric acid and polyazidoglycidyl ether; boric acid forms a borate bond with 1H,1H,2H,3H,3H-perfluorononane-1,2-diol, and polyazidoglycidyl ether is compounded through the boron-nitrogen coordination action with 1H,1H,2H,3H,3H-perfluorononane-1,2-diol, realizing the controllable preparation of the energetic perfluoroborate binder. The energetic perfluoroborate binder has high energy and stable storage, and can improve the energy and mechanical properties of the propellant.

The present invention belongs to the technical field of synthesis of genipin derivatives, and specifically relates to a method for preparing a 1-O-alkyl genipin derivative. The present invention mixes genipin, a low-carbon alcohol, a catalyst and a polar organic solvent for alkoxylation reaction; the catalyst is fluoroboric acid or a mixture of fluoroboric acid and boric acid or a mixture of boron trifluoride etherate and water; when the catalyst is fluoroboric acid or a mixture of fluoroboric acid and boric acid, the temperature of the alkoxylation reaction is ≥rt; when the catalyst is a mixture of boron trifluoride etherate and water, the temperature of the alkoxylation reaction is ≥0°C. The preparation method provided by the present invention can achieve 1-O-alkyl genipin derivatives with high R configuration selectivity under mild reaction temperature conditions by selecting fluoroboric acid or a mixture of fluoroboric acid and boric acid or a mixture of boron trifluoride etherate and water as a catalyst for alkoxylation reaction, and the preparation method is simple, the reaction conditions are mild, and it is more suitable for industrial production.

The invention discloses a preparation method and application of a pydiflumetofen intermediate, and the method comprises the following step: in the presence of cuprous oxide or cuprous salt and acid, synthesizing 2, 4, 6-trichlorobenzene diazonium fluoroborate and isopropenyl acetate into the pydiflumetofen intermediate of formula I, according to the invention, 2, 4, 6-trichloroaniline which is cheap and easy to obtain is used as a raw material to improve a Meerwein arylation reaction method, and finally industrial cheap and mass production of the intermediate I is realized.

The invention provides a six-membered sultam derivative as well as an electrochemical synthesis method and application thereof, and a 2-isoallylbenzenesulfonamide derivative and a hydroxyl-containing compound are electrified and reacted in an electrolyte to obtain the six-membered sultam derivative. The electrolyte comprises 2, 2, 6, 6-tetramethylpiperidine and an electrolyte tetrabutylammonium tetrafluoroborate; compared with the prior art, the sultam derivative can be obtained through reaction under the electrochemical condition, no oxidizing agent or reducing agent is needed in the reaction, no metal catalyst or high temperature is needed, synthesis steps are simple, side reactions are few, the yield of the target product is high, and the method can be used for industrial production.

The invention discloses a lithium ion battery and electronic equipment, the lithium ion battery comprises a positive pole piece and an electrolyte, the positive pole piece comprises a positive active material, the positive active material comprises Lix [NiyCozMntM (1-y-z-t)] O2-delta, M is at least one selected from Cr, Zr, Ca, Mg, Cu, Ti, Al, Mo, W and Zn, 0.9 lt; xlt; 1.1, 0.8 < = y < lt >; 1.0, 0 < = zlt; 0.1, 0 < = tlt; 0 < = delta < = 0.1; the electrolyte comprises an additive, the additive comprises an ionic liquid, the chemical formula of the ionic liquid is # imgabs0 #, R1 and R2 are alkyl with the carbon atom number of 1-6, and X is selected from any one of bis (fluorosulfonyl) imide, bis (trifluoromethyl) sulfonyl imide, tetrafluoroborate and acetate. The imidazolyl ionic liquid and the high-nickel positive electrode system are matched for use, so that the high-temperature cycle performance of the battery cell can be effectively improved.

This application relates to a copper-aluminum brazed terminal block and its manufacturing method, belonging to the field of power fittings technology. It consists of an aluminum-based terminal block with a copper sheet welded to it. The flux used in the welding is a high-performance, non-corrosive copper-aluminum flux composed of the following components: potassium fluoroaluminate, cesium ammonium fluoride, 1-butyl-3-methylimidazolium tetrafluoroborate, potassium fluorotitanate, and nano-copper oxide. The process involves chemically stripping the dense alumina film using highly active fluorine species released from a pure fluorinated ionic liquid, achieving film removal and avoiding the thermal effects of high temperatures. Secondly, a nano-titanium transition layer is generated in situ through a liquid-phase displacement reaction of potassium fluorotitanate on the nascent aluminum surface, achieving a qualitative change in joint strength from mechanical interlocking to intrinsic metallurgical bonding. Finally, the elimination of chlorine and the presence of a self-cleaning mechanism prevent the flux from absorbing moisture and hydrolyzing or causing electrochemical corrosion, thus ensuring long-term reliability and durability of the joint under harsh environments while achieving good connection performance.

This invention relates to a tetrafluoroborate imidazole-based metal ionic liquid, its preparation method, and its application in coating aluminum powder. The invention pertains to the preparation method of a tetrafluoroborate imidazole-based metal ionic liquid and its use in combination with aluminum powder to form a core-shell fuel (aluminum powder@metal ionic liquid). The aluminum powder@metal ionic liquid core-shell fuel uses aluminum as the core and a tetrafluoroborate imidazole-based metal ionic liquid as the shell material, prepared via solvent evaporation. This series of core-shell fuels exhibits excellent thermal properties and is primarily suitable for solid propellant fuel applications. Furthermore, the preparation method provided by this invention is simple, operates under mild conditions, and uses readily available raw materials.

An electrochemical method for preparing N-arylsulfonylimine compound, comprising the following steps: in air atmosphere, a sulfoximine compound and an alpha-keto acid are added into a reactor in a molar ratio of 1:2, an electrolyte tetrabutylammonium tetrafluoroborate, a catalyst nickel bromide are added, and then an acetone solution is added; the mixture is stirred by a magnetic stirring device, and is dissolved; two electrodes are inserted, a graphite electrode is used as a positive electrode, and a platinum sheet electrode is used as a negative electrode; 6mA of current is passed, and the current passing time is 3h; after the reaction is completed, the solvent is removed by vacuum evaporation to obtain a crude product, and the N-arylsulfonylimine compound is obtained by column chromatography purification. Compared with a traditional synthesis method, the method has the advantages that the reaction condition is mild, can be successfully carried out at room temperature, operation is simple, all operations can be carried out in an open system, an electric current is used as an oxidation method, pollution of a chemical oxidant is avoided, raw materials are easy to obtain, functional group compatibility is good, and the scope of application of a substrate is wide.

The present invention belongs to the technical field of electrocatalytic preparation of xanthene derivatives. The present invention provides a method for electrocatalytically preparing 9-(phenylsulfonyl)-xanthene derivatives, including: adding aryl diazonium tetrafluoroborate derivatives, xanthene, DABSO, tetrabutylammonium hexafluorophosphate, acetonitrile and acetic acid in an electrolytic cell, passing a direct current, and reacting for 2 hours at a certain temperature and under nitrogen protection conditions. The present invention adopts electrocatalytic synthesis of 9-(phenylsulfonyl)-xanthene, which uses electric current as an oxidant, does not require an external oxidant and other metal catalysts, and also provides higher catalytic activity and lower reaction energy barrier for the reaction; and there is no need to pre-functionalize the substrate, with high atom economy and good functional group tolerance, so various substituted 9-(phenylsulfonyl)-xanthene can be obtained with good yield. In the reaction, low-toxicity and economical acetonitrile is used as a solvent, which avoids the use of highly toxic solvents and is green and environmentally friendly.

The application provides a preparation method and application of a near-infrared two-region fluorescent sensor, and chiral single-walled carbon nanotubes are separated by using a double water phase extraction method; materials in the separation process include deionized water, polyethylene glycol, dextran, sodium dodecyl sulfate, sodium deoxycholate and cholic acid sodium hydrate; the chiral single-walled carbon nanotubes are dispersed and mixed with 4-nitrobenzene tetrafluoroboric acid diazonium salt to obtain the fluorescent sensor; high-purity (6,5)-SWCNT is efficiently and simply separated by using the double water phase extraction technology, the prepared SWCNT-NBD nanomaterial has good optical performance, including bright light emission in the near-infrared two-region, has good penetration capacity on biological tissues, the fluorescent detector (SWCNT-NBD) has low detection line, wide linear range, good selectivity on DA, and is convenient to prepare and low in cost.

The invention discloses a super capacitor electrolyte and a super capacitor, and relates to the technical field of super capacitors, the super capacitor electrolyte comprises an electrolyte, a solvent and a functional additive; the electrolyte comprises spiro quaternary ammonium tetrafluoroborate and triethyl methyl ammonium tetrafluoroborate; the solvent comprises acetonitrile and sulfolane; the functional additive is a compound with a crown ether structure prepared through a thiol-ene click reaction; the addition amount of the functional additive is 1-10% of that of the solvent. The supercapacitor electrolyte system can resist high voltage and has wide temperature adaptability, that is, the supercapacitor electrolyte system has good high temperature resistance and low temperature resistance, so that the application requirement of a supercapacitor in a complex and severe environment is met.